hades.BaseEnvironment

These instructions summarize/make heavy use of http://www.vogella.de/articles/JavaPersistenceAPI/article.html.

• Download a mocking library. This example uses JMockIt - version 0.999.9. You will need the following jar file as the first entry in your classpath:
  • jmockit.jar

(These next two steps are here for convenience, they are taken directly from http://www.vogella.de/articles/JavaPersistenceAPI/article.html

• Download a JPA implementation. This example uses [http://www.eclipse.org/eclipselink/downloads/|EclipseLink]] - version eclipselink-2.2.0.v20110202-r8913, which is the reference implementation. You will need the following two jar files in your classpath:
  • eclipselink.jar
  • javax.persistence_2.0.X.jar

• Download a database. This example uses Derby - version 10.8.1.2. You will the following jar file in your classpath:
  • derby.jar

Follow the instructions in the tutorial as is with the following three changes.

• Update the Todo class' id filed by adding the following annotation:

@SuppressWarnings("unused")

• Update the persistence XML to always drop and re-create the tables:
  • Replace this line:

<property name="eclipselink.ddl-generation" value="create-tables" />

• With this line:

<property name="eclipselink.ddl-generation" value="drop-and-create-tables" />

• Instead of creating a main, create as a test:

package shoe;
 
import static org.junit.Assert.*;
 
import java.util.List;
 
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
 
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
 
import de.vogella.jpa.simple.model.Todo;
 
public class SmokeTest {
    private EntityManagerFactory factory;
    private EntityManager em;
    private Query findAll;
 
    @Before
    public void setupDb() {
        factory = Persistence.createEntityManagerFactory("todos");
        em = factory.createEntityManager();
        findAll = em.createQuery("select t from Todo t");
        em.getTransaction().begin();
    }
 
    @After
    public void wipeTheSlateClean() {
        em.getTransaction().rollback();
        em.close();
        factory.close();
    }
 
    @Test
    public void initiallyEmpty() {
        assertEquals(0, getAllTodos().size());
    }
 
    @Test
    public void oneAddedShouldIncreaseCount() {
        Todo todo = new Todo();
        em.persist(todo);
        assertEquals(1, getAllTodos().size());
    }
 
    private List<Todo> getAllTodos() {
        @SuppressWarnings("unchecked")
        List<Todo> resultList = findAll.getResultList();
        return resultList;
    }
}